Ring die bushing of a ring die straw forming machine

Abstract

The invention relates to a ring die straw forming machine, in particular to a ring die bushing of a ring die straw forming machine and a manufacturing method thereof. The ring die is provided with a ring die through hole along the radial direction, and the bushing is installed in the ring die through hole to form a ring die straw forming machine. The ring die hole can be replaced with bushings of different compression ratios, compression ratios and taper angles as needed; the bushing base is made of No. 45 steel, and the heat treatment method is tempering after quenching, and the tempering temperature is 600-650°C between, make the Rockwell hardness of the tempered matrix at HRC40-50; polish the inner wall surface of the bushing to make the surface roughness lower than Ra3.2, and then perform coating treatment. The coating type is TiCN, and the thickness of the coating is Between 2-4μm; the coating is smooth and bright, without pores and cracks, and the hardness of the reinforced coating can reach HRC80-85. The invention will greatly reduce the maintenance cost of the ring die straw forming machine. The ring die has a long service life, low energy consumption and high efficiency.

Description

technical field [0001] The invention relates to a ring die straw molding machine, in particular to a ring die bushing of a ring die straw molding machine and a manufacturing method thereof, in particular to a design of a ring die bushing which has a long service life and can be conveniently replaced according to different requirements and manufacturing method. Background technique [0002] Crop straw is a precious resource. my country is a big agricultural country with rich straw resources, ranking first in the world; but these crop straws have not been fully utilized, and mass burning has become a major social problem, wasting resources and polluting the environment. Curing molding is a good way to solve this problem. [0003] The ring die straw molding machine has the advantages of high productivity and low energy consumption, and has gradually become the mainstream equipment for straw solidification and molding; A lot of sand is entrained. During the straw compression mo...

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Problems solved by technology

[0002] Crop straw is a precious resource. my country is a big agricultural country with rich straw resources, ranking first in the world; but these crop straws have not been fully utilized, and mass burning has become a major social problem, wasting resources and polluting the environment. Curing molding is a good way to solve this problem

[0003] The ring die straw molding machine has the advantages of high productivity and low energy consumption, and has gradually become the mainstream equipment for straw solidification and molding; A lot of sand is entrained. During the straw compression molding process, because the ring die is working under high temperature and extrusion pressure, the inner wall of the ring die hole and the material are always in a state of friction, so the wear of the ring die is very serious; when the ring die When the wear reaches a certain level, the raw material cannot be molded; therefore, the wear of the ring die determines the service life of the biomass molding machine. At present, the ring die needs to be repaired when the foreign biomass briquette fuel is produced at 800-1000t, while the domestic Only 150-300 tons can be produced, and the ring die needs to be repaired. Due to the high friction force on the ring die during molding, the current ring die processing method cannot meet the high friction environment, resulting in excessive wear of the ring die On the other hand, the current ring die is assembled from ring modules, and its manufacturing process is relatively rough, and its poor stability causes rapid wear of the ring die and increases production costs. Main Factors for Promoting Use

[0004] Chinese patent 201210339933.4 discloses a bushing for the ring die of a straw forming machine. The bushing and the ring die hole are connected through a dovetail groove gap fit, so that the bushing can be easily replaced once it is damaged. But there are still the following disadvantages: first, the bushing through the ring die hole is not necessary from the practical application point of view, because the ring die hole is only severely worn in the pre-compression cavity and the molding cavity, and the wear in the retaining cavity is very serious. Small, such a design will only further increase the production cost. The comprehensive utilization of straw is an environmental protection industry, which is widely used in rural areas, and the profit is not high. Therefore, it is necessary to reduce costs from various sources before it can be truly promoted; second, the bushing The equal-diameter hole means equal compression rate and compression ratio. Although the equal-diameter ring die hole is more conducive to processing, the working conditions of straw compression molding are more complicated. The process parameters of the die holes are also different, so the production adaptability of the equal-diameter ring die holes is poor, and the formed compacts produced have low density and poor quality; thirdly, there is no detailed introduction to the design and manufacturing process of the bushing, but Only when the parameters of the ring die are determined in advance can the design be carried out, and economical and practical manufacturing technology is also required to ensure its large-scale application in industry

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